/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.univ.fblikes.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;
import org.springframework.context.annotation.ScopedProxyMode;
import org.springframework.core.env.Environment;
import org.springframework.security.crypto.encrypt.Encryptors;
import org.springframework.social.connect.*;
import org.springframework.social.connect.jdbc.JdbcUsersConnectionRepository;
import org.springframework.social.connect.support.ConnectionFactoryRegistry;
import org.springframework.social.connect.web.ProviderSignInController;
import org.springframework.social.facebook.api.Facebook;
import org.springframework.social.facebook.connect.FacebookConnectionFactory;
import org.univ.fblikes.user.SecurityContext;
import org.univ.fblikes.user.SimpleConnectionSignUp;
import org.univ.fblikes.user.SimpleSignInAdapter;
import org.univ.fblikes.user.User;

import javax.inject.Inject;
import javax.sql.DataSource;

/**
 * Spring Social Configuration.
 */
@Configuration
public class SocialConfig {

    @Inject
    private Environment environment;

    @Inject
    private DataSource dataSource;

    /**
     * When a new provider is added to the app, register its {@link ConnectionFactory} here.
     *
     * @see FacebookConnectionFactory
     */
    @Bean
    public ConnectionFactoryLocator connectionFactoryLocator() {
        ConnectionFactoryRegistry registry = new ConnectionFactoryRegistry();
        registry.addConnectionFactory(new FacebookConnectionFactory(environment.getProperty("facebook.clientId"),
                environment.getProperty("facebook.clientSecret")));
        return registry;
    }

    /**
     * Singleton data access object providing access to connections across all users.
     */
    @Bean
    public UsersConnectionRepository usersConnectionRepository() {
        JdbcUsersConnectionRepository repository = new JdbcUsersConnectionRepository(dataSource,
                connectionFactoryLocator(), Encryptors.noOpText());
        repository.setConnectionSignUp(new SimpleConnectionSignUp());
        return repository;
    }

    /**
     * Request-scoped data access object providing access to the current user's connections.
     */
    @Bean
    @Scope(value = "request", proxyMode = ScopedProxyMode.INTERFACES)
    public ConnectionRepository connectionRepository() {
        User user = SecurityContext.getCurrentUser();
        return usersConnectionRepository().createConnectionRepository(user.getId());
    }

    /**
     * A proxy to a request-scoped object representing the current user's primary Facebook account.
     *
     * @throws NotConnectedException if the user is not connected to facebook.
     */
    @Bean
    @Scope(value = "request", proxyMode = ScopedProxyMode.INTERFACES)
    public Facebook facebook() {
        return connectionRepository().getPrimaryConnection(Facebook.class).getApi();
    }

    /**
     * The Spring MVC Controller that allows users to sign-in with their provider accounts.
     */
    @Bean
    public ProviderSignInController providerSignInController() {
        return new ProviderSignInController(connectionFactoryLocator(), usersConnectionRepository(),
                new SimpleSignInAdapter());
    }

}
